Secondary clock.



W. M. JEFFREYSz W. H. GREAHEN.

SECONDARY CLOCK.

APPLIU ATION FILED OUT. 22, 1912.

COLUMBIA PLANOnRAvn co., wAsmNG'rqN. D, c.

UNITED STATES PATENT OFFICE.

WILLIAM M. J EFFREYS AND WILLIAM H. CREAHEN, OF YOUNGSTOWN, OI-IIO.

SECONDARY CLOCK.

Specification of Letters Patent.

Patented Jan. 6, 1914.

Application filed October 22, 1912. Serial No. 727,253.

To all whom it may concern:

Be it known that we, VVILLIAM M. JEF- FREYS and WILLIAM H. CnEA'i-IEN,citizens of the United States, residing at Youngstown, in the county ofMahoning and State of Ohio, have invented certain new and usefulImprovements in Secondary Clocks, of which the following is aspecification.

Our invention relates to new and useful improvements in electricalrecording instruments and more particularly to time recordinginstruments, and the object of our invention is to provide a novel andefficient form of secondary clock movement.

A further objectof our invention is to so construct the secondary clockas to cause it to move a chart through a predetermined angle at eachimpulse which it receives from the master clock. And a further object ofour invention is to provide a recording mech anism of the abovedescribed character which may be employed as a recorder for steam, waterand vacuum gages and also for recording temperatures, humidity and thelike.

lVith these and other objects in view, our invention will be more fullydescribed, illustrated in the accompanying drawing, and thenspecifically pointed out in the claim which is attached to and forms apart of this application.

In the drawing: Figure 1 is afront elevation of our clock movement; Fig.2 is a side elevation of the same.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing by the samereference characters.

The preferred embodiment of our improved recorder includes spaced frontand rear plates 10 and 11 secured to each other at their corners byspacer pins 12. Mounted between the upper ends of the plates 10 and 11,is a solenoid 13 having a plunger 14, the lower end of which is pivotedas shown at 15 to the intermediate portion of a lever 16. One end ofthis lever is pivoted to a lug 17 extending inwardly from the rear plate11 and the opposite end of the lever extends through an opening formedin the front plate and is pivotally connected to a link 19. A bracket 20is secured to the outer face of the front plate 10 opposite the centerof the solenoid 13 and disposed parallel with the longitudinal axis ofthe plunger 14, said bracket being formed with a laterally extending ear.the solenoid. For instance,

having a vertical slot 21 through which extend spaced pins 22 carried bythe upper end of the link 19, the link being mounted for reeiprocatorymovement between the ears of the brackets. Swingingly mounted upon thelower end of this link, is a pawl 23 and secured to the linkand bearingagainst the outer face of the pawl, is a leaf spring 24.

Journaled in suitable alined bearings formed in the front and rearplates 10 and 11, is a shaft 25 carrying a ratchet gear 26 upon itsforward end and a beveled gear 27 immediately at the rear of the ratchetgear. This shaft and ratchet gear are so positioned and proportionedthat the pawl 23 is normally held in engagement with one of the teeth ofthe ratchet gear by the spring 24: in the manner shown in Fig. 1 of thedrawing. It will therefore be apparent that each time the solenoid isenergized by the passage of a current through the master clock or anyother device with which our register is operated, the plunger will bedrawn upwardly, raising the pawl 28 and turning the ratchet gear 26 to adistance equal to the space between the adjacent teeth. Upon thedecnergization of the solenoid, the link and its pawl fall by gravity tonormal position.

A vertical shaft 28 is also journaled in suitable bearings carried bythe front and rear plates and is provided at its upper end with abeveled gear 29 which meshes with the beveled gear 27. Mounted upon thelower portion of this shaft 28, is a worm gear 30 which meshes with aworm wheel 31 carried by a second transversely extending shaft 32, whichshaft is also journaled in the front and rear plates 10 and 11. Theforward end of this shaft 32 extends considerably in advence of thefront plate 10 and has its free end threaded. The shaft immediatelyadjacent the threaded portion is provided with an annular shoulder 33and a. milled binding nut 3 1 is adapted to be threaded upon the end ofthe shaft to clamp a dial plate or other suitable chart 35 against theshoulder 33 to revolve with the shaft. By means of the reduction gearsabove described, the movement of the ratchet gear is transmitted to thechart or dial and these gears may be so proportioned as to turn the dialthrough any desired angle through each impulse of if the dial isarranged to move through an angle of fifteen minutes for each impulseand the solenoid receives an impulse once a minute, the dial will makeone complete revolution in twentyfour hours.

It will of course be understood that the above described mechanism maybe inclosed in any suitable casing or that minor changes in details ofconstruction, may be made if desired, without in the slightest degreedeparting from the spirit of our invention.

The instrument may be employed for recording steam pressure in a steamsystem, if desired.

Having thus described the invention, what is claimed as new is:

A device of the character described in-- cluding a casing having frontand rear plates, parallel shafts rotatably mounted in the casing a chartcarried by one of the shafts and spaced from the outer face of the frontplate, a train of gearing operatively connecting said shafts, a solenoidinterposed between the front and rear plates of the easing, a leverpivoted by one end to a support on the inner face of the rear plate andintermediate its length to the plunger of the solenoid, a bracketsecured to the front plate of the casing opposite the center of thesolenoid and provided with a laterally extending ear disposed parallelwith the longitudinal axis of the plunger of the solenoid, said carbeing provided with a vertically disposed slot, av link slidably mountedon one side of the ear, spaced pins extending laterally from the linkand passing through the slot in the ear, said linl; being pivotedintermediate its length to the free end of the lever, a pawl pivotallymounted on the free end of the link, a spring having one end thereofsecured to the link and its other end spanning the pivotal connectionbetween the pawl and link and bearing against said pawl, and a ratchetwheel keyed upon the adjacent shaft and adapted to be driven byengagement with the pawl.

In testimony whereof we allix our signatures in presence of twowitnesses.

WILLLXM M. JEFF tEYS. It. s, VILLIAM H. CREAHEN. ILL. s]

lVitnesses Leona Jnrrnnys, H. A. ERNST.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

